01The verdict: is Haena-Wainiha water safe?
Based on EPA testing data, Haena-Wainiha's tap water is generally safe to drink. The water system earned a grade of A+ (96.9/100), meeting federal drinking water standards across key contaminant categories. The city's 1 water system serves approximately 833 residents using groundwater (wells).
Nothing over a legal limit
Every contaminant measured in Haena-Wainiha's water is within its EPA limit, and no violations are unresolved.
See the testing ↓Lead is well under the limit
90th-percentile lead is 0.0 ppb — beneath the 15 ppb federal action level and under the 5 ppb watch threshold.
See the trend ↓Check back after the next refresh
EPA data updates on a rolling basis; we fold in new samples and violations every month.
Get alerts ↓Haena-Wainiha's drinking water received a grade of A+ (96.9 out of 100), indicating excellent water quality. The city's 1 water system serves approximately 833 residents using groundwater.
Lead levels were measured at 0.0 ppb (90th percentile), well within EPA limits. This system has not yet been tested for PFAS under the EPA UCMR 5 program. The system has 2 violations on record, including 0 health-based violations. All violations have been resolved.
Haena-Wainiha ranks #13 out of 64 cities in Hawaii for water quality, placing it above average in the state. Haena-Wainiha relies on groundwater, which is generally less vulnerable to surface contamination but can be affected by naturally occurring minerals like arsenic and nitrate, as well as agricultural and industrial runoff. As a small community water system, Haena-Wainiha may have fewer resources for advanced treatment technologies and infrastructure upgrades compared to larger utilities.
02What's in Haena-Wainiha's water
Every contaminant flagged in Haena-Wainiha, on one shared scale: distance to its own legal limit. The red line is the limit — anything past it is out of compliance, and the closer a bar gets, the less headroom the system has.
Full contaminants report
| Contaminant | Detected Level | EPA Limit | Unit | Category | Status |
|---|---|---|---|---|---|
| Lead (90th percentile) LeadHeavy Metal A toxic heavy metal that can leach into drinking water from older pipes, solder, and fixtures. No amount of lead in water is considered safe. Health EffectsBrain and nervous system damage in children, kidney damage, high blood pressure, and reproductive problems in adults. EPA Limit15 ppb action level Common SourcesCorrosion of lead pipes, lead solder, brass faucets, and household plumbing. | 0.0 | 15 | ppb | Inorganic | Safe |
Cities ranked by 90th-percentile lead PF PFAS in Hawaii
Cities ranked by compounds detected Cu Copper in Hawaii
Cities ranked by 90th-percentile copper
03Haena-Wainiha's ten-year track record
Each box is one year. A green check means no EPA violations; a numbered badge counts that year's violations — red if any were health-based, amber if they were monitoring or paperwork issues. The system has 2 violations on record, including 0 health-based violations. All violations have been resolved.
All ten of the last ten years were clean — no EPA violations recorded for Haena-Wainiha.
▼ Down 5 ppb since 2010. Latest reading: 0 ppb (2023) — 0% of the action level. Sampled at higher-risk homes (90th percentile).
04Where Haena-Wainiha's water comes from
Haena-Wainiha's drinking water is drawn from underground aquifers through wells.
Groundwater
Underground aquifers reached by wells — naturally filtered, but can carry minerals like arsenic and nitrate.
Local treatment
Groundwater generally needs less treatment — typically disinfection and, where needed, mineral removal.
1 system
1 water system, operated under local government ownership.
833 people
Residents served across Haena-Wainiha's service area.
Groundwater is naturally filtered through rock and soil layers, generally requiring less treatment than surface water. However, it can contain naturally occurring contaminants like arsenic, radon, and minerals. Agricultural activity, septic systems, and industrial operations near well fields can introduce nitrates, pesticides, and volatile organic compounds. The system is operated by local government ownership and serves approximately 833 people through 1 water system.
| System name | PWSID | Population | Source |
|---|---|---|---|
| HAENA-WAINIHA | HI0000415 | 833 | Groundwater |
Water bodies near Haena-Wainiha
These water bodies shape the regional watershed and can indirectly affect groundwater quality.
05How Haena-Wainiha compares
Scores for nearby Hawaii cities on one line, with the average marked.
dashed line = Hawaii average (92/100)
Haena-Wainiha scores 96.9/100 — on par with the Hawaii average of 92/100. It outscores 9 of 10 nearby cities. Full Hawaii rankings →
91.1 / 100AWaipahu-Ewa-Waianae, HI
92.8 / 100AWailuku, HI
91.4 / 100APearl Harbor, HI
94.8 / 100AMililani Bws, HI
97.5 / 100ASchofield Barracks, HI
91.8 / 100
Compare all cities in the county — grades, violations, and contaminant data side by side.→
06What to do at home
Steps matched to what testing actually found in Haena-Wainiha's water — not generic advice.
A basic carbon filter still helps
Haena-Wainiha's water meets federal standards, but a simple carbon filter improves taste and adds a margin of safety against short-term issues.
Compare tested filters →Read your utility's annual report
Every utility must publish a yearly Consumer Confidence Report with its own testing results. It pairs well with the independent data on this page.
How to read a CCR →Watch for Haena-Wainiha alerts
We refresh EPA data monthly and surface new violations, advisories, and boil-water notices for your county on this page.
All water alerts →Frequently asked questions
Is Haena-Wainiha, HI tap water safe to drink?
Haena-Wainiha's water quality earned a grade of A+ (96.9/100). The water generally meets EPA standards and is considered safe for consumption. The city ranks #13 out of 64 cities tested in Hawaii.
What contaminants are in Haena-Wainiha's water?
Lead was measured at 0.0 ppb (90th percentile). 2 violations are on record.
How is Haena-Wainiha's water quality grade calculated?
The grade is based on four factors: violation history (40%), lead and copper levels (25%), PFAS contamination (25%), and regulatory compliance (10%). The score is also adjusted based on how complete the available data is. See our methodology page for full details.
Do I need a water filter in Haena-Wainiha?
Based on current data, basic filtration should suffice for additional peace of mind.
Where does Haena-Wainiha's water come from?
Haena-Wainiha's water is sourced from Groundwater. The city has 1 water system serving approximately 833 residents.
Is Haena-Wainiha's groundwater at risk of contamination?
Haena-Wainiha uses groundwater, which can be affected by naturally occurring contaminants like arsenic, radon, and nitrate, as well as agricultural runoff and industrial activity. The system has 2 violations on record that may relate to groundwater quality. Groundwater systems are generally less susceptible to surface contamination but should be monitored for emerging contaminants like PFAS.
How does Haena-Wainiha's water compare to other cities?
Haena-Wainiha ranks #13 out of 64 cities in Hawaii (better than 80% of state cities) and #131 out of 15382 cities nationally (99th percentile). The grade of A+ reflects the combined assessment of violation history, lead and copper levels, PFAS contamination, and regulatory compliance.
Does Haena-Wainiha's small water system affect quality?
Haena-Wainiha's system serves approximately 833 residents. Small community water systems (under 3,300 people) may have fewer financial resources for infrastructure upgrades and advanced treatment technologies. However, they are held to the same EPA drinking water standards as larger systems. This system has 2 violations on record.